feat(server): add booking, payment, and scheduler modules

Booking: reservation with atomic transactions, cancellation with refund
logic based on cancelHoursLimit (23 tests)
Payment: WeChat Pay integration (mock), order lifecycle, membership
creation on payment callback (13 tests)
Scheduler: cron tasks for slot generation, cleanup, membership expiry (8 tests)
109 total tests passing across 9 test suites

packages/server/src/scheduler/scheduler.service.ts

@@ -0,0 +1,54 @@
+import { Injectable, Logger } from '@nestjs/common'
+import { Cron } from '@nestjs/schedule'
+import { SlotGeneratorService } from '../time-slot/slot-generator.service'
+
+@Injectable()
+export class SchedulerService {
+  private readonly logger = new Logger(SchedulerService.name)
+
+  constructor(private readonly slotGenerator: SlotGeneratorService) {}
+
+  /** 02:00 daily — generate slots 14 days ahead from week templates */
+  @Cron('0 2 * * *')
+  async handleSlotGeneration(): Promise<void> {
+    try {
+      const count = await this.slotGenerator.generateSlots(14)
+      this.logger.log(`[handleSlotGeneration] Created ${count} new time slots`)
+    } catch (err) {
+      this.logger.error('[handleSlotGeneration] Failed to generate slots', err)
+    }
+  }
+
+  /** 02:30 daily — close past OPEN slots */
+  @Cron('30 2 * * *')
+  async handleCleanupSlots(): Promise<void> {
+    try {
+      const count = await this.slotGenerator.cleanupExpiredSlots()
+      this.logger.log(`[handleCleanupSlots] Closed ${count} expired slots`)
+    } catch (err) {
+      this.logger.error('[handleCleanupSlots] Failed to clean up slots', err)
+    }
+  }
+
+  /** 03:00 daily — expire memberships past their end date or with 0 sessions */
+  @Cron('0 3 * * *')
+  async handleCheckMemberships(): Promise<void> {
+    try {
+      const count = await this.slotGenerator.checkExpiredMemberships()
+      this.logger.log(`[handleCheckMemberships] Updated ${count} memberships`)
+    } catch (err) {
+      this.logger.error('[handleCheckMemberships] Failed to check memberships', err)
+    }
+  }
+
+  /** 22:00 daily — mark past CONFIRMED bookings as COMPLETED */
+  @Cron('0 22 * * *')
+  async handleCompleteBookings(): Promise<void> {
+    try {
+      const count = await this.slotGenerator.completeBookings()
+      this.logger.log(`[handleCompleteBookings] Completed ${count} bookings`)
+    } catch (err) {
+      this.logger.error('[handleCompleteBookings] Failed to complete bookings', err)
+    }
+  }
+}